CIM Motor Sacrifice

[Kevin Sevcik]

Count me in for using a FP or 775 in the shooter. They'll be lighter for a nearly equivalent level of power, and you can leave your CIMs on your drivetrain. We'll probably lean to the RS775-18, since running an 18V motor at 12V gives you a little more margin for overheating, and (I think) the slightly heavier motor will give you a higher effective inertia, when it's all said and done.

[JamesCH95]

Originally Posted by Kevin Sevcik

Count me in for using a FP or 775 in the shooter. They'll be lighter for a nearly equivalent level of power, and you can leave your CIMs on your drivetrain. We'll probably lean to the RS775-18, since running an 18V motor at 12V gives you a little more margin for overheating, and (I think) the slightly heavier motor will give you a higher effective inertia, when it's all said and done.

A word of warning, that plagued many teams last year (but not ours, at all) is that the 775s can develop case shorts and cause all sorts of nasty issues.

Neither of our 775s caused an issues, and I think its because they were both electrically insulated from the chassis. This year we will be mounting them on wood or lexan panels to keep them isolated.

Then again, I might be totally off in this evaluation.

[Phyrxes]

I still have memories of the guys up the road from us using a FP to power their 2008 shooter with a FP and a "gigantic" Zalman copper heatsink on it so it didn't melt down.

As an offseason project we had some students build an AIM High style shooter using two CIMs and AM hubs to direct mount wheels, not only did it sound like a death trap spooling up but it was really heavy. They never got around to building a version only using one CIM.

I'd still have reservations with putting one of those way up "high" on a robot.

[DoctorMagazine]

When you guys are referring to the Fisher Price motors, which motor are you referring to because there are a couple different FP motors.

[Aren Siekmeier]

Originally Posted by DoctorMagazine

When you guys are referring to the Fisher Price motors, which motor are you referring to because there are a couple different FP motors.

I listed specs for the 2011 FP (289W), and since we all get 2 of those in the kit and they are more powerful than the 2010 and prior ones, we would plan to use those.

[Jon Stratis]

Originally Posted by JamesCH95

A word of warning, that plagued many teams last year (but not ours, at all) is that the 775s can develop case shorts and cause all sorts of nasty issues.

Neither of our 775s caused an issues, and I think its because they were both electrically insulated from the chassis. This year we will be mounting them on wood or lexan panels to keep them isolated.

Then again, I might be totally off in this evaluation.

In some cases I saw, the short was transmitted through the gears/sprockets as well. Don't rely only on the mounting material to keep you safe, and come with a backup plan if you run into problems!

[Ether]

Originally Posted by compwiztobe

I listed specs for the 2011 FP (289W), and since we all get 2 of those in the kit

Originally Posted by compwiztobe

The FP-2011 has a max power of about 289W.

FP-2011? Did you mean the Fisher Price 00801-0673 ? As of this writing, the 0673 is listed in the Game Manual Chapter 04 Paragraph 4.1.8, and in the USFIRST 2012 FRC motor spec chart, but it's not listed in the 2012 Kit of Parts Checklist.

[Aren Siekmeier]

That last post was a mess, let's try to get this straight.

We got 2 00968-9013 motors in the kit. These are NOT listed on FIRST's spec sheet, but there is a 9012. Upon looking at them in person they looked like the 2011 motors (and that made sense that they would give us recent ones) but this is incorrect.

Last year's motor was listed as the 00801-0673 in the 2011 KoP, and is now listed on FIRST's spec sheet as "Gearbox: 112:1 Reduction". These specs match the motor we used in 2011.

The 2010 and prior motor is listed as a -9015 motor in all the KoP checklists, but on FIRST's spec sheet is the "Motor from the 2011 KoP"

There is additionally a 00968-2719 on the spec sheet listed as the "Motor from the 2010 KoP".

So lots of confusion. This should maybe move to the motor specs thread.

Edit:
FIRST provided motor specs here
Past years' KoP lists here
This year's KoP list here

[Bob Steele]

In the real world of FIRST you will probably find that the FP motor of the past few years if roughly equal to 1/2 of a CIM... (roughly... and I mean in practice and not just theoretically) 2 FP motors weigh less than a CIM.

In this game the shooter may be located high on your robot so make sure you consider the weight distribution carefully... going over the "bumps" is going to present difficulties and a low CG will really help you not tip over...

Remember you can double up 2 FP in a transmission by using a CIMULATOR
so in effect you have the power of a CIM in a smaller and lighter package...
You could also use a 775 cimulator to do the same thing with those motors..

Up to about 2-3 years ago the FP motors we used had little ( if any ) thermal protection and they were notorious for burning out...in the past few years they have added thermal protection which really helps their longevity and usefulness.

I am not sure about the new 500 size Andy Mark motor... yet

Also don't discount the BaneBot 550's ... they also have plenty of power (more than the FP in wattage...) but they have no thermal protection.
We used them very successfully on our lift last year...

They are rather unforgiving though...

You don't need the CIM to throw the balls unless you really want to use it..
You have plenty of other options...

Do some prototyping and see what you can find out!!

[atolb1708]

I see no real need to use CIM motors for shooting purposes when they're are other motors that can be used to do the same job. As 1708 doesn't have the option because we use 2 speeds which use up all four of our aloud CIMs. Banebot, Fisher Price, and Drill motors seems to work just fine.

[Ether]

Originally Posted by Bob Steele

don't discount the BaneBot 550's ... they also have plenty of power (more than the FP in wattage...)

Not more than the FP 00801-0673

[Ether]

Originally Posted by compwiztobe

We got 2 00968-9013 motors in the kit. These are NOT listed on FIRST's spec sheet

Does anyone have specs for this motor? Google returns no hits.

There is additionally a 00968-2719 on the spec sheet

It was listed in Paragraph 4.1.8 of the Game Manual as a 2012 legal motor, but Team Update 1 removed it and replaced it with FP9013. Last I checked, FP2719 is still listed on the USFIRST spec chart, and FP9013 is not.

[SimulationX]

during the Breakaway challenge my team used 3 omni-wheels spaced out in an equilateral triangle, all wheels faced different directions, and we could go in any direction by varying the power to each. at full power, only two wheels were in a direction capeable of pulling us foreward, but since the wheels were angled, we could only get the square root of two (1.4) CIM's worth of power out of two CIM motors

our robot was very slow and couldn't push anyone around

now, i know there are other forces in play and you will have more force than our robot, but keep in mind that with only two CIMs you will probably not push a robot with 4 CIMs

[Chris_Ely]

Hi, my teams plan right now for our ball launcher is to mount one or two of the Bane Bot RS-775-18V (at 12V) motors to CIMulators, and then into a CIMple box; which will then drive two 8" 2011 KoP wheels via chain or belt. However, we have no experiance with these motors and gear box. Do you think that this is a viable/reliable option?
Also, I see that some people have used the Fisher Price motors to drive ball launchers like this. How are these motors attached? Is there a COTS gear box, or do you have to custom make one?
Thanks.

[AlexH]

First off I refuse to sacrifice a CIM to the robot gods this year...


Now onto the more serious part of my post...

You can stick a FP motor in a banebots P60 gearbox or in a cheap Harbor Fright 18v drill gearbox (or most other 18v 900rpm single speed drills for that matter)